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154 SIGNALING IN ACCESS NETWORKSIDTIntegrated digital terminalIEInformation elementISDN Integrated Services Digital NetworkITUInternational Telecommunication UnionITU-T Telecommunication Standardization Sector of ITUL1 Layer 1L2 Layer 2L3 Layer 3LAPD Link Access Protocol D-ChannelLAPV5-DL Link Access Protocol V5 Data LinkLAPV5-EF Link Access Protocol Envelope FunctionLCLoop closureLDSLocal digital switchLELocal exchangeMMandatoryMFMapping FunctionNANot applicableOOptionalOAM Operations, administration, and maintenanceOSOperations systemPRAPrimary rate accessPSTN Public switched telephone networkRDTRemote digital terminalSAPIService access point indicatorSDHSynchronous digital hierarchySONET Synchronous optical networkSTMSynchronous transport moduleTDM Time-division multiplexingTEITerminal endpoint identifierTMCTimeslot Management ChannelTSTime slot6.7 REFERENCES1. Integrated Digital Loop Carrier System Generic Requirements, Objectives, and Interfaces,GR-303-Core Issue 4, Telcordia Technologies, Dec. 2000.2. ISDN User–Network Interface—Data Link Layer Specification, Rec. Q.921, ITU-T,Geneva, Sept. 1997.3. Digital Exchange Interfaces for Subscriber Access, Rec. Q.512, ITU-T, Geneva,Feb. 1995.4. Interface Between Data Terminal Equipment (DTE) and Data Circuit-Terminating Equipment(DCE) for Terminals Operating in the Packet Mode and Connected to Public DataNetworks by Dedicated Circuit, Rec. X.25, ITU-T, Geneva, Oct. 1996.5. Framework for Frame Mode Bearer Services, Rec. I.122, ITU-T, Geneva, Mar. 1993.

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